MySQL Error: Error while storing the user information. The user might have been deleted. Please refresh the user list.

Hi guys,

I getthing this error while trying to create new user in MySQL Administrator.

Error while storing the user information. The user might have been deleted. Please refresh the user list.

MySQL version: 5.5.23

MySQL Administrator version: 1.2.17

* i have refer to the below link but not working.

http://techo.luefher.com/databases/mysql/error-while-storing-the-user-information-when-creating-a-user-in-mysql-administrator/